Another thing I'm not too keen on, like Misty already said, is when they stand at the check-out waiting to pack your groceries for you with a big bucket sitting there for you to drop something in it as a 'thank you' for their help. I don't want their help, thank you! but I can't get through check-out any other way. It's usually the boy scouts or cubs who do that here to raise money for themselves.
On a side note, and I might be wrong here, I don't think anyone collecting money is allowed to thrust the collection box under your nose so to speak. I'm sure I heard somewhere that it's against the law now in Britain. All they're allowed to do is stand and hold the box and be seen. Maybe someone can confirm this? Like I said, I might be wrong.